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Vulnerability record · CVE-2023-53484 · published 1 October 2025

CVE-2023-53484: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: lib: cpu_rmap: Avoid use after free on rmap->obj array entries When calling irq_set_affinity_notifier() with NULL at the notify argument, it will cause freeing of the glue pointer in the corresponding array entry but will leave the pointer in the array. A subsequent call to free_irq_cpu_rmap() will try to free this entry again leading to possible use after free. Fix that by setting NULL to the array entry and checking that we have non-zero at the array entry when iterating over the array in free_irq_cpu_rmap(). The current code does not suffer from this since there are no cases where irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the notify arg) is called, followed by a call to free_irq_cpu_rmap() so we don't hit and issue. Subsequent patches in this series excersize this flow, hence the required fix.

7.8 CVSS 3.1 High EPSS 0.16% · top 95.6% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
4 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: lib: cpu_rmap: Avoid use after free on rmap->obj array entries When calling irq_set_affinity_notifier() with NULL at the notify argument, it will cause freeing of the glue pointer in the corresponding array entry but will leave the pointer in the array. A subsequent call to free_irq_cpu_rmap() will try to free this entry again leading to possible use after free. Fix that by setting NULL to the array entry and checking that we have non-zero at the array entry when iterating over the array in free_irq_cpu_rmap(). The current code does not suffer from this since there are no cases where irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the notify arg) is called, followed by a call to free_irq_cpu_rmap() so we don't hit and issue. Subsequent patches in this series excersize this flow, hence the required fix.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/4e0473f1060aa49621d40a113afde24818101d37 Patch
https://git.kernel.org/stable/c/67bca5f1d644f4e79b694abd8052a177de81c37f Patch
https://git.kernel.org/stable/c/981f339d2905b6a92ef59358158b326493aecac5 Patch
https://git.kernel.org/stable/c/c6ed54dd90698dc0744d669524cc1c122ded8a16 Patch
https://git.kernel.org/stable/c/c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4 Patch
https://git.kernel.org/stable/c/cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000 Patch
https://git.kernel.org/stable/c/d1308bd0b24cb1d78fa2747d5fa3e055cc628a48 Patch
https://git.kernel.org/stable/c/f748e15253833b771acbede14ea98f50831ac289 Patch

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Source: NIST National Vulnerability Database (record CVE-2023-53484), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.